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Physical constants used in ballistics calculations.
Constants§
- AIR_
DENSITY_ SEA_ LEVEL - Air density at sea level (kg/m³)
- BC_
FALLBACK_ CONSERVATIVE - Conservative overall BC fallback value
- BC_
FALLBACK_ HEAVY - Heavy projectiles (150-200 grains) Typical: .308 Winchester match bullets, .300 Winchester Magnum
- BC_
FALLBACK_ LARGE_ CALIBER - Large calibers (.264“ to .284“) Examples: .270 Winchester, .280 Remington, 7mm Remington Magnum
- BC_
FALLBACK_ LIGHT - Light projectiles (50-100 grains)
Typical: .223 Remington, .243 Winchester hunting bullets - BC_
FALLBACK_ MEDIUM - Medium projectiles (100-150 grains) Typical: .270 Winchester, .30-06 hunting bullets
- BC_
FALLBACK_ MEDIUM_ CALIBER - Medium calibers (.243“) Examples: .243 Winchester, 6mm Creedmoor
- BC_
FALLBACK_ SMALL_ CALIBER - Small calibers (.224“ and smaller) Examples: .17 Remington, .22-250, .223 Remington
- BC_
FALLBACK_ ULTRA_ LIGHT - Ultra-light projectiles (0-50 grains) Typical: .17 caliber varmint bullets, .22 caliber target bullets
- BC_
FALLBACK_ VERY_ HEAVY - Very heavy projectiles (200+ grains) Typical: .338 Lapua Magnum, .50 BMG bullets
- BC_
FALLBACK_ XLARGE_ CALIBER - Extra large calibers (.308“ and larger) Examples: .308 Winchester, .30-06, .300 Winchester Magnum Note: Lower than expected due to inclusion of older, less aerodynamic designs
- CD_
TO_ RETARD - Cd-to-retardation conversion for ICAO-referenced BCs.
- DEFAULT_
POWDER_ REFERENCE_ TEMP_ C - Default powder reference temperature in Celsius.
- DEFAULT_
POWDER_ REFERENCE_ TEMP_ F - Default powder reference temperature in Fahrenheit.
- FPS_
TO_ MPS - Conversion factor: feet per second to meters per second
- GRAINS_
PER_ GRAM - Grains per gram — the exact reciprocal of
GRAMS_PER_GRAIN. - GRAINS_
TO_ KG - Conversion factor: grains to kilograms
- GRAMS_
PER_ GRAIN - Grams per grain — exact by definition.
- G_
ACCEL_ MPS2 - Gravitational acceleration in m/s²
- MIN_
DIVISION_ THRESHOLD - Minimum threshold for preventing division by zero in general calculations
- MIN_
MACH_ THRESHOLD - Minimum threshold for Mach number calculations near unity
- MIN_
VELOCITY_ THRESHOLD - Minimum threshold for velocity magnitude to avoid division by zero
- MPS_
TO_ FPS - Conversion factor: meters per second to feet per second
- NUMERICAL_
TOLERANCE - General numerical tolerance for floating point comparisons
- ROOT_
FINDING_ TOLERANCE - Tolerance for root finding algorithms
- SPEED_
OF_ SOUND_ MPS - Speed of sound at sea level, standard atmospheric conditions
- STANDARD_
AIR_ DENSITY - Standard air density at sea level (kg/m³)